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  1. /*
  2.  * Copyright (C) 2003 Josef Cejka
  3.  * Copyright (C) 2005 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #include <console/console.h>
  31. #include <console/chardev.h>
  32. #include <synch/waitq.h>
  33. #include <synch/spinlock.h>
  34. #include <arch/types.h>
  35. #include <typedefs.h>
  36. #include <arch.h>
  37.  
  38. /** Standard input character device. */
  39. chardev_t *stdin = NULL;
  40.  
  41. /** Get string from character device.
  42.  *
  43.  * Read characters from character device until first occurrence
  44.  * of newline character.
  45.  *
  46.  * @param chardev Character device.
  47.  * @param buf Buffer where to store string terminated by '\0'.
  48.  * @param len Size of the buffer.
  49.  *
  50.  * @return Number of characters read.
  51.  */
  52. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  53. {
  54.     index_t index = 0;
  55.     char ch;
  56.  
  57.     while (index < buflen) {
  58.         ch = getc(chardev);
  59.         if (ch == '\n') { /* end of string => write 0, return */
  60.             buf[index] = '\0';
  61.             return (count_t) index;
  62.         }
  63.         buf[index++] = ch;
  64.     }
  65.     return (count_t) index;
  66. }
  67.  
  68. /** Get character from character device.
  69.  *
  70.  * @param chardev Character device.
  71.  *
  72.  * @return Character read.
  73.  */
  74. __u8 getc(chardev_t *chardev)
  75. {
  76.     __u8 ch;
  77.     ipl_t ipl;
  78.  
  79.     waitq_sleep(&chardev->wq);
  80.     ipl = interrupts_disable();
  81.     spinlock_lock(&chardev->lock);
  82.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  83.     chardev->counter--;
  84.     spinlock_unlock(&chardev->lock);
  85.     interrupts_restore(ipl);
  86.  
  87.     chardev->op->resume();
  88.  
  89.     return ch;
  90. }
  91.